EP2353889A1 - Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore - Google Patents
Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore Download PDFInfo
- Publication number
- EP2353889A1 EP2353889A1 EP10000720A EP10000720A EP2353889A1 EP 2353889 A1 EP2353889 A1 EP 2353889A1 EP 10000720 A EP10000720 A EP 10000720A EP 10000720 A EP10000720 A EP 10000720A EP 2353889 A1 EP2353889 A1 EP 2353889A1
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- European Patent Office
- Prior art keywords
- motor current
- tyre
- rim
- motor
- electric motor
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001419 dependent effect Effects 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims description 5
- 230000004913 activation Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
- B60C25/01—Apparatus or tools adapted for mounting, removing or inspecting tyres for removing tyres from or mounting tyres on wheels
- B60C25/05—Machines
- B60C25/132—Machines for removing and mounting tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
- B60C25/01—Apparatus or tools adapted for mounting, removing or inspecting tyres for removing tyres from or mounting tyres on wheels
- B60C25/05—Machines
- B60C25/0548—Machines equipped with sensing means, e.g. for positioning, measuring or controlling
Definitions
- the invention concerns a method for mounting a tyre on a rim or demounting a tyre from a rim. Furthermore, the invention concerns an apparatus for mounting a tyre on a rim or demounting a tyre from a rim.
- An apparatus for mounting a tyre on a rim or demounting a tyre from a rim with an electric motor which drives a shaft of a rotary disc is already known from the prior art.
- EP 0 911 190 discloses such an apparatus.
- an electric motor is used which can be powered with different supply voltages as the supply voltage differs for different countries.
- a further apparatus for mounting a tyre on a rim or demounting a tyre from a rim is shown in DE 42 05 045 ; especially DE 42 05 045 shows a rim or a tyre being positioned on the rotary disc.
- the tyre By means of a tyre fitting or removal tool the tyre is mounted on the rim or demounted from the rim.
- the electric motor is activatable by a foot pedal. By a corresponding more or less activation of the foot pedal an operator is able to change the motor torque and thus the movement of the rotary disc.
- Such a known apparatus allows a mounting and demounting of tyres which prevents the tyres from damage as the operator is able to change the motor torque and adapt it to different requirements, e.g. a high motor torque for tyres comprising a high stiffness.
- the problem of the present invention is to provide a method and an apparatus for mounting or demounting a tyre with which a further improvement of the mounting and demounting process is achieved preventing the tyres from damage.
- the invention provides a method for mounting a tyre on a rim or demounting a tyre from a rim, wherein the wheel (tyre/rim assembly) is rotated by an electric motor about an axis, wherein the motor current fed to the electric motor is controlled dependent on the rotational speed and torque required for the mounting and/or demounting operation, and wherein the motor current is automatically changed to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time.
- it is autonomously detected when a high torque peak is required and such a high torque peak is automatically applied.
- the high torque peak is achieved in changing the motor current, in particular in changing the frequency and/or the amplitude of the motor current.
- the applied high torque peak is also called “boost” function in the following.
- the "boost” function is synonymous with an activation of a pedal with which the electric motor is started. That means the “boost” function simulates a pedal retry of an operator in increasing the motor current fed to the electric motor.
- Such a motor current changing is useful as speed and torque requirements during mounting and/or demounting operations are different depending on the kind of the mounted and/or demounted tyre.
- the side walls of the tyres have different stiffness. For tyres with a high stiffness, e.g.
- the method according to the invention prevents the tyres from damage during mounting and/or demounting process.
- the high torque peak is applied to the electric motor when the present current is greater than a preset limit at a low rotational speed during a preset time.
- the actual low speed corresponds e.g. to the nominal speed of the motor at 50Hz (which approximately corresponds to 1500 rpm for a standard four-pole motor).
- the speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft. That means when the shaft rotated by the electric motor is slowed down due to a high request of torque at a low rotational speed and this high request of torque exists during a preset time, the motor current is changed.
- the preset time is longer than the period during which the high torque peak is applied.
- the preset time is three to ten times longer than the period of applying the torque peak.
- the motor current is preferably set back to normal condition after applying the torque peak. After applying the torque peak, the method for mounting or demounting a tyre is continued with the motor current for normal conditions until a further high request of torque is detected by the converter.
- the actual low speed corresponds to the nominal speed of the motor at 50Hz - which approximately corresponds to 1500 rpm for a standard four-pole motor ⁇ and the actual high speed corresponds to the nominal speed of the motor at 100Hz - which approximately corresponds to 3000 rpm for a standard four-pole motor.
- the actual low speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft, and the actual high speed of the motor is reduced by means of a gearbox to about 14 rpm at the main shaft.
- the frequency and/or the amplitude of the motor current is increased within a preset maximum limit to apply a torque peak.
- a preset limit is given, e.g. stored, and prevents that the electric motor is driven with an excessive current frequency which leads to a damage of the electric motor.
- the cycle of applying the torque peak and setting back to normal condition can be repeated.
- the invention relates to an apparatus for mounting a tyre on a rim or demounting a tyre from a rim comprising an electric motor for rotating the wheel (rim/tyre assembly) about an axis, a controlled device for delivering the motor current to the electric motor and a sensing device for sensing the motor current and transmitting corresponding signals to a control device controlling the motor current dependent on the rotational speed and torque requirement for the mounting and/or demounting operation, wherein the control device is able to change the motor current to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time.
- a time counter is connected to the control device to predetermine a time limit interval during which a motor current greater than a preset time limit is measured.
- the time counter can be a separate part or the time counter can be integrated into the control device.
- the control device can comprise a microprocessor which adjusts a power driving circuit with power switches to control the motor current.
- the electro motor is a two-phase or a three-phase electric motor, i.e. the electric motor is driven with two-phase current or three-phase current.
- the apparatus comprises a low voltage circuit providing the control device with low voltage.
- a tyre changer is diagrammatically shown, the tyre changer 10 comprising an electric motor 12, in particular three-phase motor, for driving a drive shaft 14 of a rotary disc 16.
- an electric motor 12 in particular three-phase motor
- a one-phase motor or a two-phase motor, especially induction motor can be used.
- a four-pole motor is used.
- a tyre fitting or removal head 18 is fixed on a pivotable arm 20, the arm 20 being attached to a housing 22.
- the motor current, especially the frequency and/or the amplitude of the motor current fed to the electric motor 12 is changeable which results in a different speed of the driven shaft 14.
- a sensing device 24 is connected with the electric motor 12.
- the sensing device 24 is connected with a control device 26. Signals from the sensing device 24 are transmitted to the control device 26.
- the control device 26 is able to control the motor current dependent on the rotational speed and torque requirement for the mounting and/or demounting operation.
- the control device 26 is able to change the frequency and/or the amplitude of the motor current fed to the electric motor 12.
- Such a changing in the motor current is useful as speed and torque requirements during mounting and/or demounting operations are different depending on the kind of the mounted and/or demounted tyre.
- the side walls of the tyres have different stiffness.
- the control device 26 is able to autonomously detect, when the rotation of the shaft 14 is slowed down due to high request of torque, and is able to automatically start a so-called "boost" function.
- This "boost" function is synonymous with an activation of a pedal with which the electric motor 12 is started.
- the "boost" function simulates a pedal retry of an operator. This provides a torque peak of the electric motor 12. Thereby the current fed to the electric motor 12 is changed in increasing the motor current fed to the electric motor 12 within given limit values.
- the control device 26 autonomously detects a requirement of changing the motor current fed to the electric motor 12 to apply a high torque peak. After detecting the requirement, the motor current is automatically changed. An action of an operator is thereby not necessary.
- the control device 26 comprises a microprocessor 28, an interface circuit 30 and a controlled device 32.
- the sensing device 24 is connected with the microprocessor 28, signals from the sensing device 24 indicating the motor current fed to the electric motor 12 being transmitted from the sensing device 24 to the microprocessor 28.
- the microprocessor 28 being able to adjust the controlled device 32 comprising power switches to control the motor current.
- the interface circuit 30 positioned between the microprocessor 28 and the controlled device 32 serves for converting and forwarding the commands of the microprocessor 28 to the controlled device 32.
- the interface circuit 30 provides voltage interface conversions, supplies dead time protection and shut down function protection.
- the controlled device 32 comprising power switches which are used to drive the electric motor 12 are positioned between the motor current sensing device 24 and a high voltage circuit 34, the high voltage circuit 34 powers the electric motor 12.
- a low voltage circuit 36 comprising a transformer to reduce the voltage, a bridge rectifier, filter and a regulator to provide low voltage levels being provided to the interface circuit 30 and to the circuit of the microprocessor 28.
- a time counter 37 is provided, the time counter 37 being connected to the control device 26, especially the microprocessor 28, to predetermine a time limit interval during which a motor current which is greater than a preset limit is measured. When the measured motor current is greater than a preset limit during the preset time, a high torque peak is applied.
- the time counter 37 can be integrated into the control device (not shown).
- FIG. 2 A flow chart of the method according to the invention which is conducted with the apparatus as explained above is shown in Figure 2 .
- a first step which is indicated with reference numeral 38, it is inspected if the foot pedal (not shown) is activated.
- a "low” speed means that the present speed is lower than a speed which is present with "normal” conditions. Values which represent the speed of several kinds of tyres with “normal” conditions can be entered and recalled. A “low” speed indicates a torque which exceeds the corresponding limit value. A “low” speed can be detected by the motor current sensing device 24 in an increase of the current of the electric motor 12.
- a "low" speed can be detected by a speed sensor (not shown) observing the speed of the drive shaft 14 or of the electric motor 12.
- Corresponding signals are sent by the motor current sensing device 24 or the speed sensor to the converter 26, in particular to the microprocessor 28 being part of the converter 26.
- the actual low speed corresponds to the nominal speed of the motor at 50Hz - which approximately corresponds to 1500 rpm for a standard four-pole motor ⁇
- the actual high speed corresponds to the nominal speed of the motor at 100Hz - which approximately corresponds to 3000 rpm for a standard four-pole motor.
- the actual low speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft, and the actual high speed of the motor is reduced by means of a gearbox to about 14 rpm at the main shaft.
- the present current of the electric motor 12 is compared with a maximum current in a third step 42. Thereby, it is checked, if the present current is greater than a maximum current.
- the present current of the electric motor 12 is measured by the motor current sensing device 24 and a corresponding signal is transmitted to the microprocessor 28.
- the microprocessor 28 compares the signal of the motor current sensing device 24, which corresponds to the measured current, with a stored limit value for the present kind of tyre and detects if the present current of the electric motor 12 is greater than the maximum current. Limit values for several kinds of tyres are stored in the microprocessor 28.
- a time counter 37 starts (see step 44). If the measured current of the electric motor 12 persists for a preset time, e.g. for one second (see step 46), the "boost” function is started for about 0.2 seconds. In other words, the "boost” function is conducted as long as the interrogation "Count > 1.2s" can be answered with “no", i.e. as long as the elapsed time is smaller than 1.2 seconds the "boost” function is conducted (see steps 48, 50). Is the elapsed time greater than 1.2 seconds, the motor current is set back to normal condition (see step 52).
- the "boost” function is synonymous with an activation of the pedal with which the electric motor 12 is started. That means the “boost” function simulates a pedal retry of an operator which provides a torque peak of the electric motor 12. The frequency and/or the amplitude of the motor current fed to the electric motor 12 is changed, especially increased, within given limit values.
- the method is stopped (see steps 54, 56). Otherwise, the method starts again (see steps 54, 58).
- the motor is driven with normal condition (see step 52), if the present speed of the electric motor 12 and thus of the drive shaft 14 is not low (i.d. interrogation 40 is answered with "no"), if the present current is lower than a maximum current (i.d. interrogation 42 is answered with "no") and if the measured current is for less than 1s s greater than the maximum current (i.d. interrogation 46 is answered with "no"). Furthermore, if the pedal is not activated (see step 38), the method is stopped (see step 56).
- the inventive method it is autonomously detected, when the speed of the electric motor 12 and thus of the drive shaft is slowed down due to high request of torque, and the "boost” function is automatically started. Thereby, the frequency and/or the amplitude of the current fed to the electric motor 12 is increased within maximum limits.
- This "boost" function simulates a pedal retry of an operator and provides a torque peak of the electric motor 12.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
- The invention concerns a method for mounting a tyre on a rim or demounting a tyre from a rim. Furthermore, the invention concerns an apparatus for mounting a tyre on a rim or demounting a tyre from a rim.
- An apparatus for mounting a tyre on a rim or demounting a tyre from a rim with an electric motor which drives a shaft of a rotary disc is already known from the prior art. For
example EP 0 911 190 discloses such an apparatus. Thereby, an electric motor is used which can be powered with different supply voltages as the supply voltage differs for different countries. A further apparatus for mounting a tyre on a rim or demounting a tyre from a rim is shown inDE 42 05 045DE 42 05 045 - Such a known apparatus allows a mounting and demounting of tyres which prevents the tyres from damage as the operator is able to change the motor torque and adapt it to different requirements, e.g. a high motor torque for tyres comprising a high stiffness.
- The problem of the present invention is to provide a method and an apparatus for mounting or demounting a tyre with which a further improvement of the mounting and demounting process is achieved preventing the tyres from damage.
- For this purpose, the invention provides a method for mounting a tyre on a rim or demounting a tyre from a rim, wherein the wheel (tyre/rim assembly) is rotated by an electric motor about an axis, wherein the motor current fed to the electric motor is controlled dependent on the rotational speed and torque required for the mounting and/or demounting operation, and wherein the motor current is automatically changed to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time. According to the invention, it is autonomously detected when a high torque peak is required and such a high torque peak is automatically applied. The high torque peak is achieved in changing the motor current, in particular in changing the frequency and/or the amplitude of the motor current. The applied high torque peak is also called "boost" function in the following. The "boost" function is synonymous with an activation of a pedal with which the electric motor is started. That means the "boost" function simulates a pedal retry of an operator in increasing the motor current fed to the electric motor. Such a motor current changing is useful as speed and torque requirements during mounting and/or demounting operations are different depending on the kind of the mounted and/or demounted tyre. In particular, the side walls of the tyres have different stiffness. For tyres with a high stiffness, e.g. run flat tyres, low speed and high torque are required, however for basic operations high speed and low torque are required. Advantageously, the method according to the invention prevents the tyres from damage during mounting and/or demounting process. The high torque peak is applied to the electric motor when the present current is greater than a preset limit at a low rotational speed during a preset time. The actual low speed corresponds e.g. to the nominal speed of the motor at 50Hz (which approximately corresponds to 1500 rpm for a standard four-pole motor). The speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft. That means when the shaft rotated by the electric motor is slowed down due to a high request of torque at a low rotational speed and this high request of torque exists during a preset time, the motor current is changed.
- Preferably, the preset time is longer than the period during which the high torque peak is applied.
- In particular, the preset time is three to ten times longer than the period of applying the torque peak.
- The motor current is preferably set back to normal condition after applying the torque peak. After applying the torque peak, the method for mounting or demounting a tyre is continued with the motor current for normal conditions until a further high request of torque is detected by the converter. For example, the actual low speed corresponds to the nominal speed of the motor at 50Hz - which approximately corresponds to 1500 rpm for a standard four-pole motor ― and the actual high speed corresponds to the nominal speed of the motor at 100Hz - which approximately corresponds to 3000 rpm for a standard four-pole motor. The actual low speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft, and the actual high speed of the motor is reduced by means of a gearbox to about 14 rpm at the main shaft.
- Preferably, the frequency and/or the amplitude of the motor current is increased within a preset maximum limit to apply a torque peak. Such a preset limit is given, e.g. stored, and prevents that the electric motor is driven with an excessive current frequency which leads to a damage of the electric motor.
- The cycle of applying the torque peak and setting back to normal condition can be repeated.
- Furthermore, the invention relates to an apparatus for mounting a tyre on a rim or demounting a tyre from a rim comprising an electric motor for rotating the wheel (rim/tyre assembly) about an axis, a controlled device for delivering the motor current to the electric motor and a sensing device for sensing the motor current and transmitting corresponding signals to a control device controlling the motor current dependent on the rotational speed and torque requirement for the mounting and/or demounting operation, wherein the control device is able to change the motor current to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time. With respect to the advantages it is referred to the above mentioned explanations.
- Preferably, a time counter is connected to the control device to predetermine a time limit interval during which a motor current greater than a preset time limit is measured. Thereby, the time counter can be a separate part or the time counter can be integrated into the control device.
- The control device can comprise a microprocessor which adjusts a power driving circuit with power switches to control the motor current.
- The electro motor is a two-phase or a three-phase electric motor, i.e. the electric motor is driven with two-phase current or three-phase current.
- Preferably, the apparatus comprises a low voltage circuit providing the control device with low voltage.
- The invention will be described in greater detail herein after by means of embodiments by way of example with reference to the Figures in which:
- Figure 1
- schematically shows an apparatus in which a method according to the invention can be conducted, and
- Figure 2
- shows a flow chart of the method according to the invention.
- In
Figure 1 a tyre changer is diagrammatically shown, thetyre changer 10 comprising anelectric motor 12, in particular three-phase motor, for driving adrive shaft 14 of arotary disc 16. Alternatively, a one-phase motor or a two-phase motor, especially induction motor, can be used. In particular a four-pole motor is used. On therotary disc 16 tyres being centred to the rotary axis A of therotary disc 16 can be positioned. A tyre fitting orremoval head 18 is fixed on apivotable arm 20, thearm 20 being attached to ahousing 22. - The motor current, especially the frequency and/or the amplitude of the motor current fed to the
electric motor 12 is changeable which results in a different speed of the drivenshaft 14. In order to detect the motor current fed to theelectric motor 12, asensing device 24 is connected with theelectric motor 12. Furthermore, thesensing device 24 is connected with acontrol device 26. Signals from thesensing device 24 are transmitted to thecontrol device 26. Depending on the signals detected from thesensing device 24, thecontrol device 26 is able to control the motor current dependent on the rotational speed and torque requirement for the mounting and/or demounting operation. In particular, thecontrol device 26 is able to change the frequency and/or the amplitude of the motor current fed to theelectric motor 12. Such a changing in the motor current is useful as speed and torque requirements during mounting and/or demounting operations are different depending on the kind of the mounted and/or demounted tyre. In particular, the side walls of the tyres have different stiffness. For tyres with a high stiffness, e.g. run flat tyres, low speed and high torque are required, however for basic operations high speed and low torque are required. Thecontrol device 26 is able to autonomously detect, when the rotation of theshaft 14 is slowed down due to high request of torque, and is able to automatically start a so-called "boost" function. This "boost" function is synonymous with an activation of a pedal with which theelectric motor 12 is started. That means the "boost" function simulates a pedal retry of an operator. This provides a torque peak of theelectric motor 12. Thereby the current fed to theelectric motor 12 is changed in increasing the motor current fed to theelectric motor 12 within given limit values. Thecontrol device 26 autonomously detects a requirement of changing the motor current fed to theelectric motor 12 to apply a high torque peak. After detecting the requirement, the motor current is automatically changed. An action of an operator is thereby not necessary. - The
control device 26 comprises amicroprocessor 28, aninterface circuit 30 and a controlleddevice 32. Thesensing device 24 is connected with themicroprocessor 28, signals from thesensing device 24 indicating the motor current fed to theelectric motor 12 being transmitted from thesensing device 24 to themicroprocessor 28. Depending on these signals, themicroprocessor 28 being able to adjust the controlleddevice 32 comprising power switches to control the motor current. Theinterface circuit 30 positioned between themicroprocessor 28 and the controlleddevice 32 serves for converting and forwarding the commands of themicroprocessor 28 to the controlleddevice 32. Theinterface circuit 30 provides voltage interface conversions, supplies dead time protection and shut down function protection. The controlleddevice 32 comprising power switches which are used to drive theelectric motor 12 are positioned between the motorcurrent sensing device 24 and ahigh voltage circuit 34, thehigh voltage circuit 34 powers theelectric motor 12. - Furthermore, a
low voltage circuit 36 is provided comprising a transformer to reduce the voltage, a bridge rectifier, filter and a regulator to provide low voltage levels being provided to theinterface circuit 30 and to the circuit of themicroprocessor 28. - Furthermore, a
time counter 37 is provided, thetime counter 37 being connected to thecontrol device 26, especially themicroprocessor 28, to predetermine a time limit interval during which a motor current which is greater than a preset limit is measured. When the measured motor current is greater than a preset limit during the preset time, a high torque peak is applied. Alternatively, thetime counter 37 can be integrated into the control device (not shown). - A flow chart of the method according to the invention which is conducted with the apparatus as explained above is shown in
Figure 2 . - In a first step, which is indicated with
reference numeral 38, it is inspected if the foot pedal (not shown) is activated. - Only if the pedal is activated, that means if the
first interrogation 38 can be answered with "yes", it is checked, in asecond step 40, if the present speed of theelectric motor 12 and thus of thedrive shaft 14 is low. Thereby, a "low" speed means that the present speed is lower than a speed which is present with "normal" conditions. Values which represent the speed of several kinds of tyres with "normal" conditions can be entered and recalled. A "low" speed indicates a torque which exceeds the corresponding limit value. A "low" speed can be detected by the motorcurrent sensing device 24 in an increase of the current of theelectric motor 12. Alternatively, a "low" speed can be detected by a speed sensor (not shown) observing the speed of thedrive shaft 14 or of theelectric motor 12. Corresponding signals are sent by the motorcurrent sensing device 24 or the speed sensor to theconverter 26, in particular to themicroprocessor 28 being part of theconverter 26. For example, the actual low speed corresponds to the nominal speed of the motor at 50Hz - which approximately corresponds to 1500 rpm for a standard four-pole motor ― and the actual high speed corresponds to the nominal speed of the motor at 100Hz - which approximately corresponds to 3000 rpm for a standard four-pole motor. The actual low speed of the motor is reduced by means of a gearbox to about 7 rpm at the main shaft, and the actual high speed of the motor is reduced by means of a gearbox to about 14 rpm at the main shaft. - If the present speed of the
electric motor 12 and thus of thedrive shaft 14 is low, e.g. thesecond interrogation 40 is answered with "yes", the present current of theelectric motor 12 is compared with a maximum current in athird step 42. Thereby, it is checked, if the present current is greater than a maximum current. The present current of theelectric motor 12 is measured by the motorcurrent sensing device 24 and a corresponding signal is transmitted to themicroprocessor 28. Themicroprocessor 28 compares the signal of the motorcurrent sensing device 24, which corresponds to the measured current, with a stored limit value for the present kind of tyre and detects if the present current of theelectric motor 12 is greater than the maximum current. Limit values for several kinds of tyres are stored in themicroprocessor 28. - If the measured current of the
electric motor 12 is greater than a preset limit, atime counter 37 starts (see step 44). If the measured current of theelectric motor 12 persists for a preset time, e.g. for one second (see step 46), the "boost" function is started for about 0.2 seconds. In other words, the "boost" function is conducted as long as the interrogation "Count > 1.2s" can be answered with "no", i.e. as long as the elapsed time is smaller than 1.2 seconds the "boost" function is conducted (seesteps 48, 50). Is the elapsed time greater than 1.2 seconds, the motor current is set back to normal condition (see step 52). As already explained above, the "boost" function is synonymous with an activation of the pedal with which theelectric motor 12 is started. That means the "boost" function simulates a pedal retry of an operator which provides a torque peak of theelectric motor 12. The frequency and/or the amplitude of the motor current fed to theelectric motor 12 is changed, especially increased, within given limit values. - If there are detected any faults, the method is stopped (see
steps 54, 56). Otherwise, the method starts again (seesteps 54, 58). - Furthermore, the motor is driven with normal condition (see step 52), if the present speed of the
electric motor 12 and thus of thedrive shaft 14 is not low (i.d.interrogation 40 is answered with "no"), if the present current is lower than a maximum current (i.d.interrogation 42 is answered with "no") and if the measured current is for less than 1s s greater than the maximum current (i.d.interrogation 46 is answered with "no"). Furthermore, if the pedal is not activated (see step 38), the method is stopped (see step 56). - According to the inventive method, it is autonomously detected, when the speed of the
electric motor 12 and thus of the drive shaft is slowed down due to high request of torque, and the "boost" function is automatically started. Thereby, the frequency and/or the amplitude of the current fed to theelectric motor 12 is increased within maximum limits. This "boost" function simulates a pedal retry of an operator and provides a torque peak of theelectric motor 12.
Claims (11)
- Method for mounting a tyre on a rim or demounting a tyre from a rim,
wherein the wheel (tyre/rim assembly) is rotated by an electric motor (12) about an axis (A),
wherein the motor current fed to the electric motor (12) is controlled dependent on the rotational speed and torque required for the mounting and/or demounting operation, and
wherein the motor current is automatically changed to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time. - Method according to claim 1,
wherein the preset time is longer than the period during which the high torque peak is applied. - Method according to claim 1 or claim 2,
wherein the preset time is three to ten times longer than the period of applying the torque peak. - Method according to one of the preceding claims,
wherein the motor current is set back to normal condition after applying the torque peak. - Method according to one of the preceding claims,
wherein the frequency and/or the amplitude of the motor current is increased within a preset maximum limit to apply a torque peak. - Method according to one of the preceding claims,
wherein the cycle of applying the torque peak and setting back to normal condition is repeated. - Apparatus for mounting a tyre on a rim or demounting a tyre from a rim comprising:an electric motor (12) for rotating the wheel (rim/tyre assembly) about an axis (A),a controlled device (32) for delivering the motor current to the electric motor (12) anda sensing device (24) for sensing the motor current and transmitting corresponding signals to a control device (26) controlling the motor current dependent on the rotational speed and torque requirement for the mounting and/or demounting operation,wherein the control device (26) is able to change the motor current to apply a high torque peak, when the measured motor current is greater than a preset limit at a low rotational speed during a preset time.
- Apparatus according to claim 7,
wherein a time counter (37) is connected to the control device (26) or integrated into the control device (26) to predetermine a time limit interval during which a motor current greater than a preset time limit is measured. - Apparatus according to claim 7 or claim 8,
wherein the control device (26) comprises a microprocessor (28) which adjusts a controlled device (32) with power switches to control the motor current. - Apparatus according to one of claims 7 to 9,
wherein the electro motor (12) is a two-phase or three-phase electric motor. - Apparatus according to one of claims 7 to 10,
wherein the apparatus comprises a low voltage circuit (36) providing the control device (26) with low voltage.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20100000720 EP2353889B1 (en) | 2010-01-25 | 2010-01-25 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
ES10000720T ES2390414T3 (en) | 2010-01-25 | 2010-01-25 | Procedure for mounting a tire on a tire or removing a tire from a tire and associated device |
CN201010552161.3A CN102133845B (en) | 2010-01-25 | 2010-11-17 | Method and apparatus for mounting a tyre on a rim or demounting a tyre from a rim |
US13/013,249 US8967223B2 (en) | 2010-01-25 | 2011-01-25 | Method for mounting A tyre on a rim or demounting A tyre from a rim and apparatus therefore |
HK11112426.6A HK1158146A1 (en) | 2010-01-25 | 2011-11-17 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
US14/517,413 US10513158B2 (en) | 2010-01-25 | 2014-10-17 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
US15/698,042 US10507699B2 (en) | 2010-01-25 | 2017-09-07 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
US16/675,307 US11358423B2 (en) | 2010-01-25 | 2019-11-06 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20100000720 EP2353889B1 (en) | 2010-01-25 | 2010-01-25 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2353889A1 true EP2353889A1 (en) | 2011-08-10 |
EP2353889B1 EP2353889B1 (en) | 2012-08-22 |
Family
ID=42269697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20100000720 Active EP2353889B1 (en) | 2010-01-25 | 2010-01-25 | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
Country Status (5)
Country | Link |
---|---|
US (1) | US8967223B2 (en) |
EP (1) | EP2353889B1 (en) |
CN (1) | CN102133845B (en) |
ES (1) | ES2390414T3 (en) |
HK (1) | HK1158146A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3000627A1 (en) | 2014-09-23 | 2016-03-30 | Snap-on Equipment S.r.l. | Improved method and device for fitting or removing tyres on rims |
CN109080381A (en) * | 2017-06-13 | 2018-12-25 | 斯耐普昂设备有限公司 | For tire to be fitted into wheel rim and removes the improved method and equipment of tire from it |
IT201900009321A1 (en) * | 2019-06-18 | 2020-12-18 | Nexion Spa | TIRE CHANGING DEVICE |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10513158B2 (en) | 2010-01-25 | 2019-12-24 | Snap-On Equipment Srl A Unico Socio | Method for mounting a tyre on a rim or demounting a tyre from a rim and apparatus therefore |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4028080A1 (en) | 1990-09-05 | 1992-03-12 | Hofmann Maschinenbau Gmbh | DEVICE FOR TREATING MOTOR VEHICLE TIRES ON WHEELS OF WHEELS |
DE4205045C1 (en) * | 1992-02-19 | 1993-08-19 | Hofmann Werkstatt-Technik Gmbh, 6102 Pfungstadt, De | Pneumatic tyre fitting device for vehicle wheel - uses current amplitude regulation of drive motor to control torque during fitting process |
EP0911190A1 (en) * | 1997-10-24 | 1999-04-28 | CORGHI S.p.A. | Tyre removal machine |
EP1247661A2 (en) | 2001-04-03 | 2002-10-09 | Hofmann Maschinen- und Anlagenbau GmbH | Apparatus and method for mounting vehicle tyres on rims of disc wheels |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3556708B2 (en) * | 1994-08-08 | 2004-08-25 | 株式会社ブリヂストン | Internal pressure filling device for tire-rim assembly |
US6745809B1 (en) * | 2002-12-09 | 2004-06-08 | Bandag Licensing Corporation | Tire buffing apparatus |
-
2010
- 2010-01-25 EP EP20100000720 patent/EP2353889B1/en active Active
- 2010-01-25 ES ES10000720T patent/ES2390414T3/en active Active
- 2010-11-17 CN CN201010552161.3A patent/CN102133845B/en active Active
-
2011
- 2011-01-25 US US13/013,249 patent/US8967223B2/en active Active
- 2011-11-17 HK HK11112426.6A patent/HK1158146A1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4028080A1 (en) | 1990-09-05 | 1992-03-12 | Hofmann Maschinenbau Gmbh | DEVICE FOR TREATING MOTOR VEHICLE TIRES ON WHEELS OF WHEELS |
DE4205045C1 (en) * | 1992-02-19 | 1993-08-19 | Hofmann Werkstatt-Technik Gmbh, 6102 Pfungstadt, De | Pneumatic tyre fitting device for vehicle wheel - uses current amplitude regulation of drive motor to control torque during fitting process |
EP0911190A1 (en) * | 1997-10-24 | 1999-04-28 | CORGHI S.p.A. | Tyre removal machine |
EP1247661A2 (en) | 2001-04-03 | 2002-10-09 | Hofmann Maschinen- und Anlagenbau GmbH | Apparatus and method for mounting vehicle tyres on rims of disc wheels |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3000627A1 (en) | 2014-09-23 | 2016-03-30 | Snap-on Equipment S.r.l. | Improved method and device for fitting or removing tyres on rims |
EP3000627B1 (en) | 2014-09-23 | 2016-11-30 | Snap-on Equipment S.r.l. | Improved method and device for fitting or removing tyres on rims |
EP3147141A1 (en) | 2014-09-23 | 2017-03-29 | Snap-on Equipment S.r.l. | Improved method and device for fitting or removing tyres on rims |
CN109080381A (en) * | 2017-06-13 | 2018-12-25 | 斯耐普昂设备有限公司 | For tire to be fitted into wheel rim and removes the improved method and equipment of tire from it |
US10620606B2 (en) | 2017-06-13 | 2020-04-14 | Snap-On Equipment S.R.L. | Method and equipment for fitting tyres onto rims and removing them therefrom |
CN109080381B (en) * | 2017-06-13 | 2020-12-08 | 斯耐普昂设备有限公司 | Improved method and apparatus for fitting and removing a tire to and from a rim |
IT201900009321A1 (en) * | 2019-06-18 | 2020-12-18 | Nexion Spa | TIRE CHANGING DEVICE |
EP3753757A1 (en) * | 2019-06-18 | 2020-12-23 | NEXION S.p.A. | Tyre changing apparatus |
EP3753757B1 (en) | 2019-06-18 | 2022-04-06 | NEXION S.p.A. | Tyre changing apparatus |
US11999205B2 (en) | 2019-06-18 | 2024-06-04 | Nexion S.P.A. | Tyre changing apparatus for demounting and mounting a tyre of a vehicle wheel |
Also Published As
Publication number | Publication date |
---|---|
CN102133845B (en) | 2015-07-15 |
EP2353889B1 (en) | 2012-08-22 |
CN102133845A (en) | 2011-07-27 |
HK1158146A1 (en) | 2012-07-13 |
ES2390414T3 (en) | 2012-11-12 |
US20110181099A1 (en) | 2011-07-28 |
US8967223B2 (en) | 2015-03-03 |
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